SOFT TISSUE BALANCING IN ARTICULAR SURGERY
Systems and methods may be used to perform robot-aided surgery. A system may include a robotic controller to monitor a position and orientation of an end effector coupled to an end of a robotic arm. The robotic controller may apply a force to a bone using the end effector, such as via a soft tissue balancing component. The robotic controller may determine soft tissue balance using information from a tracking system, such as a position of a first tracker affixed to the bone. The soft tissue balance may be output, such as to a display device.
This application claims the benefit of priority to U.S. Provisional Applications Nos. 62/350,958, filed Jun. 16, 2016, titled “Method and System for Balancing Soft Tissue in Articular Surgery”; 62/375,049, filed Aug. 15, 2016, titled “Method and System for Balancing Soft Tissue in Articular Surgery”; 62/424,732 filed Nov. 21, 2016, titled “Soft Tissue Balancing in Articular Surgery”; and 62/501,585, filed May 4, 2017, titled “Soft Tissue Balancing in Articular Surgery”, each of which is hereby incorporated herein by reference in its entirety.
TECHNICAL FIELDThe present application relates to computer-assisted orthopedic surgery used to assist in the placement of implants at articular surfaces of bones.
BACKGROUNDComputer-assisted surgery has been developed in order to help a surgeon in altering bones, and in positioning and orienting implants to a desired location. Computer-assisted surgery may encompass a wide range of devices, including surgical navigation, pre-operative planning, and various robotic devices. One area where computer-assisted surgery has potential is in orthopedic joint repair or replacement surgeries. For example, soft tissue balancing is an important factor in articular repair, as an unbalance may result in joint instability. However, when performing orthopedic surgery on joints, soft tissue evaluations are conventionally done by hand, with the surgeon qualitatively assessing the limits of patient's range of motion. The conventional technique may result in errors or lack precision.
In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. Like numerals having different letter suffixes may represent different instances of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed in the present document.
The systems and methods described herein may be used for soft tissue balancing using a robotic arm. A robotic arm, used during a surgical procedure may perform soft tissue balancing assessment. For example, a component (such as a pin, a cutting block, etc., as further described below) may anchor to a bone and the robotic arm may be driven to pull on the bone or other anatomy to perform the soft tissue balancing assessment. In an example, the soft tissue may be placed under tension to determine balance. Applied tension may be determined using information received from a force/torque sensor in the robotic arm. The robotic arm may include a sensor (e.g., inertial, optical, encoder, etc.) to measure a rotation indicative of a rotation required for soft tissue balancing. The soft tissue balancing may be performed with the robotic arm with a leg in flexion or in extension. In an example, a computer-assisted surgery (CAS) system may be used to implement or control the robotic arm.
In an example, a robotic arm may raise an end effector (e.g., located at a distal end of the robotic arm) to displace a femur, while the tibia remains still by gravity, by its fixation to the table (e.g., when a foot support is used), by a human (e.g., surgical assistant or the surgeon), by surgical tape, self-adherent wrap or tape, or other fixing devices or components to secure the tibia. In another example, the robotic arm may use a laminar spreader to spread the bones apart. The laminar spreader may be inserted in the gap between the femoral condyles and the tibial plateau. In order to assist the laminar spreader, additional devices may be used and manipulated by the robotic arm. For example, the robotic arm may manipulate a clamp to benefit from the leveraging of the clamp to apply a greater moment of force at the bones. The laminar spreader may include a gear mechanism (e.g., planetary gear device, rack and pinion, etc.) to assist in amplifying the force of the robotic arm.
A joint laxity may be determined using a sensor on the robotic arm or a component attached to the robotic arm, such as to assist in the soft-tissue balancing at different times during a surgical procedures. For example, soft-tissue balancing may be determined prior to having the robotic arm perform an alteration to the bone, to confirm a predetermined implant size or location on the bone, or to enable adjustments to the predetermined implant size or location on the bone. In another example, the soft-tissue balancing may be determined after one or more cut planes have been made, such as to determine whether further adjustments are necessary.
Referring to the drawings and more particularly to
The CAS system 10 may be robotized, in which case it may have a robot arm 20, a foot support 30, a thigh support 40 and a CAS controller 50. The robot arm 20 is the working end of the system 10, and is used to perform bone alterations as planned by an operator or the CAS controller 50 and as controlled by the CAS controller 50. The foot support 30 supports the foot and lower leg of the patient, in such a way that it is only selectively movable. The foot support 30 may be robotized in that its movements may be controlled by the CAS controller 50. The thigh support 40 supports the thigh and upper leg of the patient, again in such a way that it is only selectively or optionally movable. The thigh support 40 may optionally be robotized in that its movements may be controlled by the CAS controller 50. The CAS controller 50 controls the robot arm 20, the foot support 30, or the thigh support 40. Moreover, as described hereinafter, the CAS controller 50 may perform a range-of-motion (ROM) analysis and implant assessment in pre-operative planning, with or without the assistance of an operator. The CAS controller 50 may also guide an operator through the surgical procedure, by providing intraoperative data of position and orientation and joint laxity boundaries, as explained hereinafter. The tracking apparatus 70 may be used to track the bones of the patient, and the robot arm 20 when present. For example, the tracking apparatus 70 may assist in performing the calibration of the patient bone with respect to the robot arm, for subsequent navigation in the X, Y, Z coordinate system.
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In order to preserve the fixed relation between the leg and the coordinate system, and to perform controlled movements of the leg as described hereinafter, a generic embodiment is shown in
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The controller 50 may hence have a robot driver 51, such as when the robot arm 20 is part of the CAS system 10. The robot driver 51 is tasked with powering or controlling the various joints of the robot arm 20, foot support 30 and thigh support 40, when applicable. As shown with bi-directional arrows in
The CAS controller 50 may use a processor to implement force measurement 52. Force measurement 52 may include receiving the signals from the sensors A, and calculating the instant forces in the foot support 30, representative of the tension/stress in the knee joint, or in the robot arm 20, as exemplified hereinafter. The instant forces may be used to perform ROM analysis 53 using the processor, along with the foot support tracking data from the robot driver 51. Alternatively or additionally, the ROM analysis 53 may use tracking data received from the tracking device 70 to determine the range of motion of the leg, as explained hereinafter. The ROM analysis 53 may convert the signals from the tracking device 70 into position or orientation data. In the latter case, various types of tracking technology may be used to determine the instant flexion/extension and varus/valgus, such as optical tracking as illustrated in
The processor may be used to perform an implant assessment 54 to determine how an implant or implants will impact the range of motion. Using the ROM analysis 53, the implant assessment 54 takes into consideration the geometrical configuration of the implants based on selectable locations on the bone. For example, the implant assessment 54 may include the bone models B from pre-operative imaging (e.g., MRI, CT-scans), whether in 3D or in multiple 2D views. The implant assessment 54 may include the implant models C, such the 3D model files including implants of different dimensions.
The implant assessment 54 may be performed in a fully automated manner by the processor, in evaluating from the bone model, implant models or from the ROM analysis 53 desired implant sizes and location on the bone (i.e., in position and orientation), to balance soft tissue tension/stress. Exemplary formats of the implant assessment are shown in
The implant assessment 54 may optionally include operator participation. The illustrations of
The output D may also be a navigation file for the robot arm 20 to perform bone alterations based on the pre-operative planning from the implant assessment 54, when the system 10 is robotized. The navigation file may include patient-specific numerical control data defining the maneuvers to be performed by the robot arm 20 as directed by the robot driver 51 of the system 10, or of another system 10 in an operating room. The navigation file for robotized surgery may incorporate a calibration subfile to calibrate the robot arm 20 and patient joint prior to commencing surgery. For example, the calibration subfile may include the bone model B of the patient, for surface matching to be performed by a registration pointer of the robot arm 20. The robot arm 30 may obtain a cloud of bone landmarks of the exposed bones, to reproduce a 3D surface of the bone. The 3D surface may then be matched to the bone model B of the patient, to set the 3D model in the X, Y, Z coordinate system.
The use of the tracking apparatus 70 may be determinative on the information that will be in the navigation file C, and may provide tracking data to perform the ROM analysis 53. For example, the tracking apparatus 70 may assist in performing the calibration of the patient bone with respect to the robot arm 20, for subsequent navigation in the X, Y, Z coordinate system. According to an embodiment, the tracking apparatus 70 comprises a camera that optically sees and recognizes retro-reflective references 71A, 71B, and 71B, so as to track the limbs in six DOFs, namely in position and orientation. In an embodiment featuring the robot arm 20, the reference 71A is on the tool head 24 of the robot arm 20 such that its tracking allows the controller 50 to calculate the position or orientation of the tool head 24 and tool 26A thereon. Likewise, references 71B and 71C are fixed to the patient bones, such as the tibia for reference 71B and the femur for reference 71C. As shown, the references 71 attached to the patient need not be invasively anchored to the bone, as straps or like attachment means may provide sufficient grasping to prevent movement between the references 71 and the bones, in spite of being attached to soft tissue. However, the references 71B and 71C could also be secured directly to the bones. Therefore, the ROM analysis 53 of the controller 50 may be continuously updated to obtain a current position or orientation of the robot arm 20 or patient bones in the X, Y, Z coordinate system using the data from the tracking apparatus 70. As an alternative to optical tracking, the tracking system 70 may consist of inertial sensors (e.g., accelerometers, gyroscopes, etc) that produce tracking data to be used by the controller 50 to continuously update the position or orientation of the robot arm 20. Other types of tracking technology may also be used.
The calibration may be achieved in the manner described above, with the robot arm 20 using a registration pointer on the robot arm 20, and with the assistance of the tracking apparatus 70 when present in the robotized surgery system 10. Another calibration approach is to perform radiography of the bones with the references 71 thereon, at the start of the surgical procedure. For example, a C-arm may be used for providing suitable radiographic images. The images are then used for the surface matching with the bone model B of the patient. Because of the presence of the references 71 as fixed to the bones, the intraoperative registration may then not be necessary, as the tracking apparatus 70 tracks the position or orientation of the bones in the X, Y, Z coordinate system after the surface matching between X-ray and bone model is completed.
In an example, the detachable pin guide component 506 may include a cut guide (e.g., an slot for inserting a saw or other surgical instrument). For example, the detachable pin guide component 506 may include a femoral cut guide, a tibial cut guide, a 4-in-1 cut guide, or the like. In an example, the detachable pin guide component 506 may be configured for use with a specific implant or may be used generically.
In an example, a bushing may be used, such as between the detachable pin guide component 506 and the end effector component 504. The bushing may be used to prevent jamming between the end effector component 504 and the detachable pin guide component 506 or allow for easy removal of the detachable pin guide component 506. The bushing may be removable, and may be affixed to the end effector component 504. In another example, the end effector component may include one or more pins and the detachable pin guide component 506 may include one or more apertures; these features may be in addition to or may replace the one or more pins of the detachable pin guide component 506 (e.g., pins 508 or 510) or the apertures of the end effector component 504.
The detachable pin guide component 506 may include a groove corresponding to a groove on the end effector component 504. When the detachable pin guide component 506 and the end effector component 504 are coupled, the grooves may provide an aperture for receiving a soft tissue balancing component. The robotic arm 502 may apply force to the soft tissue balancing component using the end effector component 504 or the detachable pin guide component 506 locked to the end effector component 504. The soft tissue balancing component (e.g., as described in further detail below, for example in the discussion of
The soft tissue balancing component may be used to perform a ligament balance pull test. Based on the pull test, a femoral rotation may be determined. The femoral rotation may be presented (e.g., using a graphical user interface, such as those described below in the discussion of
The femoral implant rotation may be determined such that the rotation may compensate for an imbalance in soft tissue tension between medial and lateral compartments. The rotation of the femur during the pull test may be directly related to the determined femoral implant rotation such that a rectangular or balanced gap results from applying the rotation. For example, when the rotation is applied to placement of the implant, the gap may be balanced between the medial and the lateral compartments. In an example, the robotic arm 502 may apply a force to perform the pull test by using the soft tissue balancing component to pull on the femur. To perform the test, the robotic arm 502 may apply one or more known loads to increase the accuracy of the determined rotation.
In an example, a torque or force sensor may be used to measure torque of one or more of the components depicted in
In an example, a ligament test or other soft tissue balancing test may be performed before a bone resection cut is performed. For example, the soft tissue balancing test may be performed before any resection of a femur or a tibia. In an example, the soft tissue balancing test may be performed after resection and implantation of an implant to verify that the soft tissue is correctly balanced. For example, a first test may be performed pre-resection, which may result in a rotation angle to be used for balancing, and a second test may be performed after the implant is inserted to verify that the rotation angle was correct or that the implant was properly seated.
In an example, resecting a bone may include using the robotic arm 502. The robotic arm 502 may have a cut guide attached to the end effector component 504 to guide the resection. A guide may be used to align a cutting, burring, or sawing device with a target object, such as a target bone. Cut guides are often manually placed by a surgeon on the target object. In other examples, cuts are made using fully autonomous robotic cutting devices. In another example, a surgeon may guide the robotic arm 502 collaboratively with force assistance from the robotic arm 502 (e.g., using a force sensor coupled to the robotic arm 502). In this example, the surgeon may apply a small directional force while the robotic arm 502 moves in response. The robotic arm 502 may then automatically align to a cut plane in response to a surgeon selection (e.g., on the robotic arm 502 or on a user interface). In an example, the cut guide may be used to precisely align a surgical instrument to make a cut, such as on a target bone or other target object. The alignment of the end effector component 504 may involve a planning system with a user interface including positioning a representation of the end effector component 504 on a representation of the target object. During the surgical procedure, a selectable indication on an intraoperative user interface (e.g., those of
In an example, the spike portion 607 of the spike 602 may include an enlarged surface area to minimize bone damage. In an example, different shaped spikes may be used (e.g., flat, rectangular, triangular, round, etc.), such as to accommodate the patella or soft tissue. In an example, the shaft portion 603 of the spike 602 and a component used to secure or couple with the spike 602 (e.g., a robotic arm or components attached thereto) may have a combined thickness, average thickness, or maximum thickness similar to (e.g., within a tolerance of) or less than a femoral implant to be used. For example, the shaft portion 603 of the spike 602 and the component used to secure or couple with the spike 602 may have a size such that a patellar tendon is under natural tension when the spike 602 is used to apply force to the femur.
A force applied by the robotic arm 604 on the spike 602 may cause the femur 606 to move, putting ligaments in tension. As the ligaments are pulled by the force on the femur 606, a balancing test may be performed. For example, tension in the ligaments may be measured or observed, force on the femur 606 may be tracked, or a rotation angle may be determined or observed. The rotation angle may then be used to set a target femoral rotation.
In an example, arrow 612 may represent a pull direction (e.g., force direction) that the spike 602 pulls the femur 606. For example, the arrow 612 may point along a line parallel to a plane of a resection cut of the femur 606. In an example, the arrow 612 may point along a line perpendicular to a plane formed by a top surface of the pin guide component 608 or perpendicular to an axis of the spike 602.
In an example, the platform arms 705A-705B of the condyle pivot 702 may include enlarged surface areas to minimize bone damage. In an example, different shaped platform arms 705A-705B may be used (e.g., flat, rectangular, triangular, round, etc.). In an example, the shaft portion 703 of the condyle pivot 702 and a component used to secure or couple with the condyle pivot 702 (e.g., a robotic arm or components attached thereto) may have a combined thickness, average thickness, or maximum thickness similar to (e.g., within a tolerance of) or less than a femoral implant to be used. For example, the shaft portion 703 of the condyle pivot 702 and the component used to secure or couple with the condyle pivot 702 may have a size such that a patellar tendon is under natural tension when the condyle pivot 702 is used to apply force to the femur.
The platform arms 705A-705B may each apply a same force or may apply different forces. For example, a torque may be applied to the condyle pivot 702 by the robotic arm 704 to keep the platform arms 705A-705B aligned along a plane, which may include varying force between the platform arms 705A-705B. When a limit is reached, for example, a first ligament is put in tension at a threshold level or a threshold force is reached, the relative forces applied on the platform arms 705A-705B may be used to determine a rotation angle to be used when resecting the femur 706 or when creating or inserting an implant. In another example, the platform arms 705A-705B may have equal force applied to each, and be allowed to rotate (e.g., away from an initial plane). The angle of the platform arms 705A-705B (e.g., relative to the initial plane) at an end position may be used to determine the rotation angle for later use. The end position may be determined when a threshold tension is reached on ligaments (e.g., a medial and a lateral ligament), when a threshold force is reached, or when a predetermined distance is reached (e.g., 5 mm, 10 mm, a distance corresponding to a tibia implant thickness such as 10 mm, 11 mm, 12 mm, etc.), which may include a safety factor (e.g., +/−1-5 mm), or the like. In an example, a combination of end position markers may be used, such as a predetermined distance approximately equal to a tibia implant thickness (e.g., an insert (poly) or an implant assembly, which may be predetermined using planning techniques), while retaining a maximum force as safety factor. For example, when a maximum force is reached before the predetermined distance, the robotic arm may be stopped. In another example, balanced ligaments may be used to mark the end position. The threshold tension may be determined visually or using a sensor. The end position (e.g., when rotation stops) may be determined by optical navigation in an example.
A force applied by the robotic arm 704 on the condyle pivot 702 may cause the femur 706 to move, putting ligaments in tension. As the ligaments are pulled by the force on the femur 706, a balancing test may be performed. For example, tension in the ligaments may be measured or observed, force on the femur 706 may be tracked, or a rotation angle may be determined or observed.
In an example, a pivot point of the platform arms 705A-705B may be at the shaft portion 703 of the condyle pivot 702. The shaft portion 703 may be aligned, using the robotic arm 704, at various points of the femur 706. For example, the pivot point may be located at a medial condyle in a varus knee. In another example, pivot point may be the center of the knee. In yet another example, instead of using a spike as in
In an example, a device may be inserted into a joint, such that turning a screw of the device may allow the soft tissue balancing test to be performed. For example, the device may expand at the turn of the screw. In an example, the robotic arm 704 may turn the screw. In an example, a force sensor for detecting force on the tibia, on the femur, or between the tibia and the femur may be the eLIBRA soft tissue force sensor device from Zimmer Biomet of Warsaw, IN.
The example device illustrated in
In an example, arrow 712 may represent a pull direction (e.g., force direction) that the condyle pivot 702 pulls the femur 706. For example, the arrow 712 may point along a line parallel to a plane of a resection cut of the femur 706. In an example, the arrow 712 may point along a line perpendicular to a plane formed by a surface of the pin guide component 708 or a surface of the condyle pivot 702, for example a surface in contact with the femur 706.
In an embodiment, the CAS controller 50 may operate the robot arm 20 to perform a robotized soft-tissue balancing assessment, such as by using a processor to perform soft-tissue balancing 56, although it may also be done without robotized assistance. Referring to
In
The processor may perform soft-tissue balancing 56 to quantify joint laxity to assist in the soft-tissue balancing at different moments during the surgical procedures operated by the CAS controller 50. For example, the soft-tissue balancing 56 may assess soft-tissue balancing prior to having the robot arm 20 perform the alterations to the bone, to confirm the desired implant sizes and location on the bone produced by the implant assessment 54, or to enable adjustments to the desired implant sizes and location on the bone, and impact the output of the resurfacing evaluator 55. The soft-tissue balancing 56 may assess soft-tissue after cut planes have been made, to determine whether further adjustments are necessary.
In another embodiment, the output D is in the form of a patient-specific cut guide 3D file, for a patient-specific cut guide to be machined or 3D printed for operative use. For example, the patient-specific cut guide may have negative surfaces of the bone model for unique positioning on the bone, such that cut planes and drill guides are placed as planned. As another example, the output D may be a navigation file, of the type programmed into inertial sensor units manually navigated by an operator. Referring to
In an example, the soft tissue assessment may be performed with the leg in flexion (e.g., as shown in
A bone spike may be used to secure the j-shaped adaptor 1006 to a bone. For example, the bone spike may be placed by a surgeon or using the robotic arm 1002 at a predetermined location on the bone. The j-shaped adaptor 1006 may be fitted around the spike with a spike adaptor anchor located at a distal end of the j-shaped adaptor 1006. The j-shaped adaptor 1006 may be fitted around the spike using the robotic arm 1002, such as automatically, or using force sensing and surgeon input. The j-shaped adaptor 1006 may then be used to apply a force on the bone (e.g., the femur) to pull the bone away form a second bone (e.g., the tibia) to conduct a soft tissue balancing test. The robotic arm 1002 may apply the force on the j-shaped adaptor 1006, which then in turn applies the force on the bone spike, which then applies the force on the bone. The soft tissue balancing test may be performed with the patella or soft tissue in place (e.g., not dislocated) by using the j-shaped adaptor 1006 to avoid the patella or soft tissue. For example, the j-shaped adaptor 1006 may reach around the patella, but remain rigid when the force is applied on the j-shaped adaptor 1006 by the robotic arm 1002, thus pulling the bone (e.g., the femur), while avoiding the patella. A straight component adaptor used instead of the j-shaped adaptor 1006 may be interfered with by the patella and require dislocation of the patella. Performing the soft tissue balancing test with the patella in place may result in more accurate results than performing the soft tissue balancing test with the patella dislocated.
In an example, the robotic arm 1002 may apply a force on the j-shaped adaptor 1006 to cause the j-shaped adaptor 1006 to pull on the bone spike until a threshold force is reached, a threshold tension in the soft tissue is reached, according to a preoperative plan, a surgeon stops the procedure, a predetermined distance is reached, or the like. The predetermined distance (e.g., 5 mm, 10 mm, a distance corresponding to a tibia implant thickness such as 10 mm, 11 mm, 12 mm, etc.), may include a safety factor (e.g., +/−1-5 mm), or the like. In an example, a combination of end position markers may be used, such as a predetermined distance approximately equal to a tibia implant thickness (e.g., predetermined using planning techniques), while retaining a maximum force as safety factor. For example, when a maximum force is reached before the predetermined distance, the robotic arm may be stopped. In another example, balanced ligaments may be used to mark the end position. The j-shaped adaptor 1006 may pull on the bone spike until a distance matching a preoperatively or intraoperatively known thickness of a tibial implant is reached. When the j-shaped adaptor 1006 completes pulling, an angle of rotation of the bone may be recorded (e.g., by surgical planning software, a robotic controller, etc.) for later pin positioning or cut guide placement. In an example, the j-shaped adaptor 1006 may include a horseshoe-shaped adapter (i.e., two j-shaped adaptors connected at their distal ends).
In another example, the soft tissue balancing test when the knee is in extension may include using a plate fixed to the tibia to pull on the tibia. The torque may be measured (e.g., using a sensor) to determine an amount of imbalance. In an example, the test may be performed by a plate that is free to rotate. The free rotation plate may be used to apply force on the tibia until the varus/valgus angles are zero to find a balance. In an example, the jig 1102 may include a spacer block. The spacer block may widen to apply tension to perform a ligament balance test.
In an example, the difference displayed in the user interface 1200 between the two ligaments may include a difference in force, a difference in torque, or a difference in displacement between the two ligaments. As releases are performed, the user interface 1200 may be updated in real time to display updated differences. For example, a release may be performed on the lateral ligament in the example shown for user interface 1200, which may cause the balance between the medial and lateral ligaments to become closer to even. In an example, a robotic arm may apply a constant force on a bone to allow a surgeon to perform the ligament releases while watching the extension ligament balance in real time. In another example, a robotic arm may be used to perform the ligament releases. The process may be iterated until the ligament balance is achieved.
FMCL+FLCL=FRBT Eq. 1
The moment of force (or torque) applied by the robotic arm 1306 may be known using a force or torque sensor, such as between the end effector 1304 and the robotic arm 1306. The moment may be labeled MRBT and may be balanced by moments of equal and opposite torque at medial and lateral distances (labeled LMCL and LLCL) from the MRBT moment to the medial force and the lateral force according to Eq. 2 below:
FMCL·lMCL+FLCL·lLCL=MRBT Eq. 2
The lateral and medial distances may be known using a tracking system, such as an optical tracking system, using known dimensions of the end effector, or using sensors attached to components of the system. Using the known FRBT and MRBT and the known distances, Eqs. 1 and 2 may be solved for the FMCL and the FLCL. These two forces may be used to determine balance in soft tissue, such as the medial collateral ligament and the lateral collateral ligament. The two forces may be output on a display device or user interface, such as those shown in
In the example shown in
Referring to
A similar graph may be produced by the implant assessment 54, to illustrate the impact of given implants at a given location on the bones. However, as shown in
Referring now to
Referring to
Referring to
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According to
Then, according to
Referring to
Therefore, at the outset of the surgical workflow steps guided by GUI 120, the system 10 has recorded joint laxity data. The recorded information may be based on force feedback felt by the surgeon manipulating the tibia relative to the femur, or may be the result of manipulations by robotized components using sensors A and output by the force measurement 52 when the robotized components are programmed to limit force values. The recorded range of motion and joint laxity information may include maximum flexion angle, maximum extension angle, range of motion, varus and valgus angle values at extension, at flexion, or at any desired angle, anterior drawer distance, posterior drawer distance. The recorded information may be as a function of 3D bone models B of the tibia and femur, or of other bones in different surgical procedures. The order of information gathering using the GUI 120 may be changed from the order described above.
In an example, one or more of the GUIs 2200A or 2200B may provide a remote video or allow for a remote audio connection, such as with a remote surgeon. The remote video or remote audio may be a real-time connection to allow the remote surgeon to discuss a procedure or provide training with a local surgeon or to monitor the local surgeon. A GUI used by the remote surgeon may provide the remote surgeon with a video display of a surgical field operated by the local surgeon.
Referring to
Accordingly, the processor may perform the implant assessment 54 or the soft tissue balancing 56, and may propose implant components and locations for the implant components via the GUI 130. The GUI 130 gives the possibility to an operator to modify the implant components or their locations, by dynamically updating in real-time quantitative data related to joint laxity and range of movement, to assist the operator is finalizing the resection planning. When the implants are selected and their locations are set, the information of the GUI 130 is converted into another form of the output D, such as personal surgical instrument tool files or data to perform resection as decided, a navigation file for the robot arm 20 when present, or a navigation file for tracked tools. The GUI 130 may also be used post-resection, to provide the joint laxity data for the “as-resected” state. The data may be used to document the surgical procedure. This may also allow post-resection corrections when deemed necessary. It may be required to return to GUI 100 or 110 to recalibrate the bones to obtain more precision in the assessment.
In an example, the knee may be opened and a navigated tibial cut may be made. In an example, variances in the tibial cut may be related to a depth of the cut, which may be relatively standard for most surgeons taking reference from either the high or low tibial plateau. Once the tibial cut has been made the tibial force detection system 2400 may be placed. The tibial force detection system 2400 may include a tibial baseplate and a polyethylene trial combination. The tibial force detection system 2400 may expand medially and laterally, such as to accommodate various sized knees. In an example, the tibial force detection system 2400 may have a medial or lateral tilting hemi-plateau with the ability to rise and fall all four quadrants independently. The displacement up and down and the force experienced by each quadrant may be measured, such as electronically or hydraulically using a sensor. In an example, the tibial force detection system 2400 may be an active device such that upward or downward movement may be measured as the knee (e.g., before femoral cuts are performed) is put through a range of motion test. In an example, measuring the movement during the range of motion test may be performed while tracking the patella. In an example, varus or valgus forces may be applied, such as by a robotic arm on the knee or by a surgeon through a range of motion (e.g., the entire range or a predetermined interval, such as 10, 30, 60, 90 degrees, or as performed by the surgeon). The sequence may be repeated with a pre-stress test to better appreciate the knee mechanics, for example, after correction for a lax medial collateral ligament (MCL) or lateral collateral ligament (LCL). In an example, the sequence may be repeated after the femoral cuts have been made or after the femoral trial is seated to provide an opportunity for further improvements to the trial or to optimize soft tissue balancing.
In an example, when a knee requires soft tissue releases, the releases may performed in a staged and sequential fashion and a re-assessment of the improved kinematics may be performed, for example, after each intervention. This process allows a quantification of knee kinematics during different measurement points intraoperatively. The quantifications may be used to balance the soft tissue more accurately than previous techniques. The quantifications may be saved to a database, such as for modeling, machine learning to predict outcomes in future cases, or the like. In an example, an indication may be provided to a surgeon regarding useful releases for a particular patient. In another example, an indication of femoral component sizing AP, location AP, or rotation may be provided to improve flexion/extension gaps throughout the range 0 to 90 degrees, which may include accounting for a location of the patella by using the patella tracking.
In an example, a robotic arm may be used to assess bone quality. Using the assessed bone quality, a system may determine whether to use bone cement or to stem a patient when placing an implant, such as the tibial baseplate 2402. In another example, the tibial baseplate 2402 may be hydraulically powered. The hydraulic power may be used to cause the tibia or femur to rotate to a tension rotation angle automatically. The angle may be recorded, such as by using sensors within the tibial baseplate 2402. The tibial baseplate 2402 may be used to expand the gap between the tibia and the femur.
In an example, the patella sensor 2504 may be placed on the back of the patella 2502, for example prior to an incision or bone cut. The patella sensor 2504 may be used to determine patella position during a range of motion test. For example, the patella sensor 2504 may include an accelerometer, a magnetometer, a gyroscope, an RFID chip, an optical tracking sensor, or other location sensor. In an example, the patella sensor 2504 may be located around the periphery of the patella 2502, for example to detect and output the outline of the patella 2502. In another example, a size of the patella 2502 may be measured (e.g., via preoperative or intraoperative imaging or direct measurement), and a position of the patella sensor 2504 relative to the patella 2502 may be known, allowing a location of the entirety of the patella 2502 to be known.
The location of the patella 2502 may be used during a surgical procedure, such as a knee replacement. During a knee replacement procedure, a robotic arm may be used to perform aspects of the procedure. The robotic arm may use the detected location of the patella 2502 (from the patella sensor 2504) to perform a patella cut or to avoid the patella while making other cuts. In an example, the patella sensor 2504 may be a passive sensor. In an example, a tracking assembly may be used, such as that described in U.S. Pat. No. 8,571,637 to Biomet Manufacturing, LLC, which is herein incorporated by references in its entirety.
Augmented reality is a technology for displaying virtual or “augmented” objects or visual effects overlaid on a real environment. The real environment may include a room or specific area (e.g., a surgical field), or may be more general to include the world at large. The virtual aspects overlaid on the real environment may be represented as anchored or in a set position relative to one or more aspects of the real environment. For example, a virtual robotic arm 2604 of
A surgeon may control the virtual robotic arm 2604 by interacting with the virtual robotic arm 2604 (e.g., using a hand to “interact” with the virtual robotic arm 2604 or a gesture recognized by a camera of the AR device). The virtual robotic arm 2604 may then be used to control the robotic arm 2602. For example, the surgeon may move the virtual robotic arm 2604 and the robotic arm 2602 may move correspondingly.
In the example shown in
In an example, aspects of the robotic arm 2602 may be controlled by pressing one or more virtual buttons that may appear virtually overlaid in a real environment. For example, a button may be displayed virtually to cause the robotic arm 2602 to move to a first position to aid in performing or to perform a surgical technique. Using the virtual button allows the surgeon to remain in place without needing to turn or avert his or her vision to a display device. This allows the surgeon to maintain focus on the surgical field and monitor the robot, as well as reducing time for the procedure.
In an example, using virtual control elements (e.g., 2604, 2606, or 2608) to control the robotic arm 2602 to perform a procedure may avoid the use of force sensing. For example, instead of controlling the robotic arm 2602 using force sensing when a surgeon moved the robotic arm 2602, the robotic arm 2602 may respond to movements of the virtual control elements. In another example, force sensing may be used in addition to the augmented reality elements described above. For example, force sensing may be used to communicate information to a system using the robotic arm. For example, tapping on the robotic arm 2602 may cause the robotic arm 2602 to lock in place, confirm actions, deny actions, etc. In another example, information may be communicated using virtual buttons as described above. Using the virtual control elements may allow the robotic arm 2602 to be driven in an active mode throughout a procedure, instead of having non-active modes or locations where the active mode is disabled.
The technique 3000 includes an operation 3010 to use the determined rotation to calculate pin placement for a cut guide (e.g., a 4-in-1 cut guide) to obtain a desired or predetermined femoral component rotation. Operation 3010 may be performed by a processor, such as using surgical procedure planning software to provide instructions to the processor. The technique 3000 includes an operation 3012 to output pin placement locations or to place pins for the cut guide. The technique 3000 includes an operation 3014 to perform cuts using the placed cut guide. In an example, a tibial cut may be performed, optionally after operation 3014 or before operation 3002. In an example, any one or more of operations 3002, 3004, 3006, 3008, 3012, 3014, or the tibial cut may be performed using a robotic arm. In another example, the technique 3000 may include an operation to output a pin placement using the rotation angle for updating a preoperative plan intraoperatively. The output pin placement be used instead of preoperative pin placement locations, or an average or weighted average may be used.
In an example, the technique 3000 may include an optional operation 3016 to apply a force to a bone, such as the femur or the tibia, to perform a soft tissue balancing test, using an end effector of a robotic arm, which may apply a force to the soft tissue balancing component. In an example, the technique 3000 may include an optional operation 3016 to output information about soft tissue balance. In another example, the technique 3000 may include applying a force to the femur or the tibia using the soft tissue balancing component without the use of a robotic arm.
The technique 3100 includes an operation 3104 to monitor a position and orientation of an end effector coupled to the end of a robotic arm, for example using a robotic controller. The technique 3100 includes an operation 3106 to move the robotic arm to a soft tissue balancing test position and orientation relative to the bone. The technique 3100 includes an optional operation 3108 to control the robotic arm to retain the position and orientation relative to the bone when the bone moves, for example using the robotic controller. The optional operation 3108 may include receiving an indication of movement of the bone from the tracking system. The technique 3100 includes an operation 3110 to apply a force to the bone using an end effector of the robotic arm. The technique 3100 includes an optional operation 3112 to track a position and orientation of the end effector when moved by the robotic controller.
The technique 3100 includes an operation 3114 to determine soft tissue balance using the position and orientation of the end effector or information from the tracking system, such as a position of the first tracker affixed to the bone. In an example, determining the soft tissue balance may include using force information from a force sensor coupled between the end effector and the robotic arm. The technique 3100 may include an operation to identify manual movement of the end effector using a force sensor and allowing the manual movement of the end effector relative to the bone. In an example, the end effector may be coupled to a distal end of a bone spike after the bone spike is coupled to the bone. The technique 3100 may include an operation to output the soft tissue balance, such as for display on a user interface.
The technique 3100 may include an operation to release the force on the bone when the soft tissue balancing test indicates that soft tissue connected to the bone is in balance, when a threshold force is reached, when a threshold tension is reached, when a predetermined distance (e.g., a distance equal to a tibial implant thickness), or the like. Releasing the force on the bone may include returning the force to zero, such as by increments. For example, the soft tissue balancing test indicates that the soft tissue connected to the bone is in balance based on detecting the bone in a pre-determined orientation during the test. In another example, the soft tissue balancing test indicates that soft tissue connected to the bone is in balance when sufficient data is collected to determine a balance in the soft tissue, and wherein the balance is an indication of the difference in tension between a medial side and a lateral side of the joint. The balance may indicate an angle for a resection cut to be made in a joint replacement procedure. The technique 3100 may include an operation to perform a release of a portion of soft tissue connected to the bone based on the soft tissue balance. The technique 3100 may include an operation to output, for example for display on a user interface, an indication of soft tissue balance or an angle of rotation of the bone relative to a second bone.
The technique 3100 may include an operation to calculate a target femoral implant rotation using a determined rotation of the femur during a soft tissue balancing test. For example, the determined rotation used may be when the gap balance is equal to a predetermined gap distance. The target femoral implant may be the inverse or opposite of the determined rotation. In an example, the technique 3100 may include an operation to store the target femoral implant rotation, such as in memory or a database, for use by planning software.
The technique 3200 includes an operation 3206 to manipulate the soft tissue balancing device during the soft tissue balancing test using a robotic arm. The operation 3206 may include applying tension to the joint using the robotic arm through the soft tissue balancing device during the soft tissue balancing test. The technique 3200 includes an operation 3208 to output an indication of tension in the soft tissue during a soft tissue balancing test. In an example, the first bone is a femur, and the soft tissue includes ligaments connecting the femur to a tibia of the patient joint. The technique 3200 may include using the robotic arm is to manipulate the soft tissue balancing device with the femur and the tibia in flexion or extension.
The technique 3200 may include an operation to output, from the robotic arm, a resection angle for an at least partial joint replacement to a computing device to calculate soft tissue balance in the joint. The computing device may be used to calculate a pin placement location for a cut guide based on the resection angle. In an example, a pin placement trial or pins may be positioned or placed, for example using the robotic arm, at a location on the first bone according to the pin placement location. The technique 3200 may include an operation to output, from a force sensor, force data indicative of soft tissue tension in the patient joint when the force is applied to the first bone by the soft tissue balancing component. In an example, soft tissue tension may be determined at the patient joint based on the force data.
The technique 3200 may include an operation to move the robotic arm to a soft tissue balancing test position and orientation relative to the first bone. In an example, the robotic arm may be controlled to retain the position and orientation relative to the first bone when the bone moves. The operation may include applying a force to the first bone using the soft tissue balancing component. The operation may include tracking movement of the first bone using an optical tracking system including a first optical tracker affixed to the first bone of the patient and a second optical tracker affixed to the robotic arm. The operation may include determining the tension in the soft tissue during a soft tissue balancing test using the tracked movement of the first bone. The operation may include tracking a position and orientation of the soft tissue balancing component when moved, and determining soft tissue tension using the position and orientation of the end effector and information from the optical tracking system including a position of the second optical tracker affixed to the robotic arm and a position of the first optical tracker affixed to the first bone. In an example, the operation may include determining a tension in medial soft tissue and a tension in lateral soft tissue using a force vector of the soft tissue balancing component on the first bone provided by the force sensor and a relative bone orientation of the first bone to a second bone provided by the optical tracking system.
User interface 3300B of
User interface 3300C of
The user guide 3314 may include a force bar 3313 or a distance bar 3315. The force bar 3313 may be used to display a current pulling force (e.g., of a robotic arm on the femur). In an example, the robotic arm may be stopped automatically by a robotic controller when the force reaches a maximum force, which may be displayed on the force bar 3313. In an example, a surgeon may control the robotic arm by adjusting the force bar 3313. The distance bar 3315 may move simultaneously with the force bar 3313 in an example. The distance bar 3315 shows a distance pulled, such as a distance from the femur to the tibia (whether the femur or the tibia is pulled). In an example, the distance bar 3315 may be controlled by a surgeon to move the robotic arm similar. In an example, the distance bar 3315 may include a maximum distance pulled, which when the femur and the tibia are separated by the maximum distance, the robotic arm may be stopped.
User interface 3300D of
One or more of user guides 3304, 3306, 3314, or 3316 may include information on ligament balance. For example, a soft tissue balancing test may be performed, and force information, tension information, or other sensor data may be sent to the one or more of user guides 3304, 3306, 3314, or 3316 to display soft tissue balance, such as a rotation angle to balance the ligaments. In another example, the one or more of user guides 3304, 3306, 3314, or 3316 may display a measured resection technique, for example by providing feedback on actual measured angles or detected forces after or before resection, in addition to the rotation angle at which there is balance.
In an example, medial and lateral borders of a tibial tubercle may be identified and used to determine a medial third landmark location. The one or more of user guides 3304, 3306, 3314, or 3316 may display the medial and lateral borders or the medial third landmark location. For example, a robotic arm may be used to identify a most medial boundary of a tibial tuberosity. The robotic arm may be used to identify a most lateral boundary of the tibia tuberosity. A system may use these identified boundaries to accurately display and locate a location known as a medial third location on the tibial tuberosity. Identifying this location may not be reproducibly performed with conventional instrumentation, such as with sub-millimeter metric precision. This location may be used to assist in a rotational placement of a tibial base plate for a knee arthroplasty as a reference point.
Various Notes & ExamplesEach of these non-limiting examples may stand on its own, or may be combined in various permutations or combinations with one or more of the other examples.
Example 1 is a robot-aided surgical system comprising: a tracking system including a first tracker affixed to a bone of a patient, the tracking system configured to track movement of the bone; a robotic controller to: monitor a position and orientation of an end effector coupled to an end of a robotic arm; apply a force to the bone using the end effector; determine soft tissue balance using information from the tracking system including a position of the first tracker affixed to the bone; and output the soft tissue balance.
In Example 2, the subject matter of Example 1 optionally includes a soft tissue balancing component coupled to the end effector and configured to transfer force from the end effector to the bone.
In Example 3, the subject matter of Example 2 optionally includes wherein the soft tissue balancing component comprises at least one of a spike, a condyle pivot, a jig, or an adaptor, wherein the adaptor is shaped to avoid a patella or soft tissue of a knee joint of the patient.
In Example 4, the subject matter of Example 3 optionally includes wherein the soft tissue balancing component comprises the condyle pivot, and wherein the condyle pivot comprises a plurality of platform arms each capable of applying an individually determined force to the bone.
In Example 5, the subject matter of any one or more of Examples 3-4 optionally include wherein the soft tissue balancing component comprises the jig, and wherein the jig includes at least one of a spacer block or a flat attachment.
In Example 6, the subject matter of any one or more of Examples 1-5 optionally include a force sensor coupled to the robotic arm, and wherein to determine the soft tissue balance, the robotic controller is to use force information from the force sensor.
In Example 7, the subject matter of Example 6 optionally includes wherein the robotic controller is to determine the force information when a pull test performed by the robotic arm reaches a predetermined gap distance from the bone to a second bone, the force information indicative of an equal force between two ligaments connecting the bone to the second bone.
In Example 8, the subject matter of any one or more of Examples 1-7 optionally include wherein to output the soft tissue balance, the robotic controller is to output an indication of the degree of rotation of the bone.
In Example 9, the subject matter of Example 8 optionally includes wherein the robotic controller is to determine a location to place a cut guide for resecting the bone using the robotic arm based at least in part the indication of the degree of rotation.
In Example 10, the subject matter of any one or more of Examples 1-9 optionally include wherein the determined soft tissue balance indicates a difference in tension between a medial side and a lateral side of a knee joint of the patient.
In Example 11, the subject matter of any one or more of Examples 1-10 optionally include wherein to output the soft tissue balance, the robotic controller is to output an amount of force applied by the end effector on the bone when the bone reaches a predetermined gap thickness in relation to a second bone.
In Example 12, the subject matter of any one or more of Examples 1-11 optionally include a cutting device to perform a release of a portion of soft tissue connected to the bone based on the soft tissue balance.
In Example 13, the subject matter of any one or more of Examples 1-12 optionally include a display device to display an indication of the output soft tissue balance or an angle of rotation of the bone relative to a second bone.
In Example 14, the subject matter of any one or more of Examples 1-13 optionally include wherein the robot controller is further to determine alterations required on the bone to receive at least one implant in a given location, using a model of the at least one implant and the soft tissue balance.
Example 15 is a robot-aided surgical system comprising: a tracking system including a first tracker affixed to a bone of a patient, the tracking system configured to track movement of the bone; a robotic controller to: monitor a position and orientation of an end effector coupled to an end of a robotic arm; apply a force to the bone using a soft tissue balancing component coupled to the end effector, the soft tissue balancing component configured to transfer force from the end effector to the bone; and determine soft tissue balance using information from the tracking system including a position of the first tracker affixed to the bone and force information from a force sensor coupled to the robotic arm; and a display device to display an indication of the soft tissue balance including a tension of at least one ligament connecting the bone to a second bone or an angle of rotation of the bone relative to the second bone.
In Example 16, the subject matter of Example 15 optionally includes wherein the indication of the soft tissue balance includes an indication of a difference in tension between a medial ligament and a lateral ligament of a knee joint of the patient.
In Example 17, the subject matter of any one or more of Examples 15-16 optionally include a cut guide coupled to the robotic arm to guide a resection cut in a joint replacement procedure based on the angle of rotation of the bone relative to the second bone.
In Example 18, the subject matter of any one or more of Examples 15-17 optionally include a cutting device coupled to the robotic arm to perform a release of a portion of soft tissue connected to the bone based on the soft tissue balance.
In Example 19, the subject matter of any one or more of Examples 15-18 optionally include a cut guide coupled to the robotic arm to guide a resection on a tibia of the patient before determining the soft tissue balance.
In Example 20, the subject matter of Example 19 optionally includes wherein the robotic controller is further to determine a pin placement location for a cut guide based at least in part on the angle of rotation of the bone relative to the second bone.
Example 21 is a robot-aided knee arthroplasty system comprising: a leg holder to affix anatomy of a patient during an arthroplasty procedure; an end effector of a robotic arm to couple to a femur of the knee joint with a soft tissue balancing component that permits the femur to freely rotate while coupled to the end effector; a robotic controller to: cause the robotic arm to apply a pulling force to the femur to increase a gap distance between the femur and a tibia of the knee joint; measure the gap distance between the femur and the tibia and a rotation of the femur; and store, when the gap balance is equal to a predetermined gap distance, the rotation of the femur as a target femoral implant rotation; and a surgical planning system to plan a position and orientation of a resection such that inserting a femoral implant on the femur causes the femur to achieve the target femoral implant rotation.
In Example 22, the subject matter of Example 21 optionally includes a cut guide coupled to the robotic arm to guide a cutting device to perform the resection.
In Example 23, the subject matter of Example 22 optionally includes wherein the robotic controller is to: determine a pin hole location on the bone based at least in part on the indication of the degree of rotation, the pin hole location determined such that a pin inserted into the pin hole location aligns the cut guide to the bone; cause the robotic arm to place a pin guide component, coupled to the end effector of the robotic arm, on the bone such that a drill hole of the pin guide component aligns with the pin hole location.
In Example 24, the subject matter of any one or more of Examples 21-23 optionally include a tracking system to track trackers affixed to the femur and the tibia and to output tracking information, and wherein to measure the gap distance between the femur and tibia and the rotation of the femur, the robotic controller is to use the tracking information.
In Example 25, the subject matter of any one or more of Examples 21-24 optionally include wherein the robotic controller is further to cause the robotic arm to apply a pushing force to the tibia and calculate a tension in a lateral collateral ligament and a medial collateral ligament of the knee joint as the pushing force is applied to the tibia with the robotic arm, and further comprising a display device to display an indication of the tension in the lateral collateral ligament and the medial collateral ligament.
Example 26 is at least one machine-readable medium including instructions for performing robot-aided surgery, which when executed by a processor, cause the processor to: cause a robotic arm to apply a pulling force to a femur, using a soft tissue balancing component coupled to the femur such that the femur freely rotates, to increase a gap distance between the femur and a tibia of the knee joint; measure the gap distance between the femur and a tibia and a rotation of the femur; and calculate a target femoral implant rotation using the rotation of the femur, when the gap balance is equal to a predetermined gap distance; store the target femoral implant rotation; and plan, using a surgical planning system, a position and orientation of a resection such that inserting a femoral implant on the femur causes the femur to achieve the target femoral implant rotation.
In Example 27, the subject matter of Example 26 optionally includes instructions to: track trackers affixed to the femur and the tibia; output tracking information; and use the tracking information to measure the gap distance between the femur and tibia and the rotation of the femur.
In Example 28, the subject matter of any one or more of Examples 26-27 optionally include instructions to: cause the robotic arm to apply a pushing force to the tibia; calculate a tension in lateral and medial compartments (e.g., a lateral collateral ligament and a medial collateral ligament) of the knee joint as the pushing force is applied to the tibia with the robotic arm; and output an indication of the tension in the lateral and medial compartments.
In Example 29, the subject matter of any one or more of Examples 26-28 optionally include instructions to determine a pin placement location for a cut guide based at least in part on the rotation of the femur.
In Example 30, the subject matter of Example 29 optionally includes instructions to cause the robotic arm to position a pin placement trial for placing a pin at a location on the bone according to the pin placement location.
Example 31 is a robot-aided surgical system comprising: a bone spike adapted to be secured in a distal end of a first bone in a joint of a patient; a soft tissue balancing device comprising a force sensor and a spike socket couplable to a distal end of the bone spike, the force sensor adapted to measure resistance in soft tissues connected to the first bone; a robotic arm to manipulate the soft tissue balancing device during the soft tissue balancing test; and an output device to output an indication of tension in the soft tissue during a soft tissue balancing test.
In Example 32, the subject matter of Example 31 optionally includes wherein the soft tissue balancing device is an end effector on the robotic arm or a j-shaped arm coupleable to the bone spike.
In Example 33, the subject matter of any one or more of Examples 31-32 optionally include wherein the robotic arm applies tension to the joint through the soft tissue balancing device during the soft tissue balancing test.
In Example 34, the subject matter of any one or more of Examples 31-33 optionally include wherein the robotic arm and soft tissue balancing device provide output to a computing device to calculate soft tissue balance in the joint.
In Example 35, the subject matter of Example 34 optionally includes wherein the soft tissue balance is output in a medial tension and a lateral tension.
In Example 36, the subject matter of any one or more of Examples 34-35 optionally include wherein the soft tissue balance is output as a resection angle for an at least partial joint replacement.
In Example 37, the subject matter of Example 36 optionally includes wherein the resection angle is selected to balance the soft tissue after at least a portion of the joint is replaced with a prosthesis.
In Example 38, the subject matter of any one or more of Examples 36-37 optionally include wherein the computing device is to calculate a pin placement location for a cut guide based on the resection angle.
In Example 39, the subject matter of Example 38 optionally includes wherein the robotic arm is further to position a pin placement trial for placing a pin at a location on the first bone according to the pin placement location.
In Example 40, the subject matter of any one or more of Examples 31-39 optionally include a retention device to restrain a second bone of the joint of the patient during the soft tissue balancing test.
In Example 41, the subject matter of any one or more of Examples 31-40 optionally include a force sensor to output force data indicative of soft tissue tension in the patient joint when the force is applied to the first bone by the soft tissue balancing component.
In Example 42, the subject matter of Example 41 optionally includes a processor to determine soft tissue tension at the patient joint based on the force data.
In Example 43, the subject matter of any one or more of Examples 31-42 optionally include a robotic controller to: move the robotic arm to a soft tissue balancing test position and orientation relative to the first bone; control the robotic arm to retain the position and orientation relative to the first bone when the bone moves; and apply a force to the first bone using the soft tissue balancing component.
In Example 44, the subject matter of Example 43 optionally includes an optical tracking system including a first optical tracker affixed to the first bone of the patient and a second optical tracker affixed to the robotic arm, the optical tracking system to track movement of the first bone, and further comprising a processor to determine the tension in the soft tissue during a soft tissue balancing test using the tracked movement of the first bone.
In Example 45, the subject matter of Example 44 optionally includes wherein the processor is further to: track a position and orientation of the soft tissue balancing component when moved by the robotic controller; and determine soft tissue tension using the position and orientation of the end effector and information from the optical tracking system including a position of the second optical tracker affixed to the robotic arm and a position of the first optical tracker affixed to the first bone.
In Example 46, the subject matter of Example 45 optionally includes wherein the processor is to use a force vector of the soft tissue balancing component on the first bone provided by the force sensor and a relative bone orientation of the first bone to a second bone provided by the optical tracking system to determine a tension in medial soft tissue and a tension in lateral soft tissue.
Example 47 is a method for performing robot-aided surgery comprising: securing a bone spike in a distal end of a first bone in a joint of a patient; measuring resistance in soft tissues connected to the first bone using a force sensor of a soft tissue balancing device coupled to a distal end of the bone spike via a spike socket; manipulating the soft tissue balancing device during the soft tissue balancing test using a robotic arm; and outputting an indication of tension in the soft tissue during a soft tissue balancing test.
In Example 48, the subject matter of Example 47 optionally includes wherein the first bone is a femur, and the soft tissue includes ligaments connecting the femur to a tibia of the patient joint, and further comprising using the robotic arm is to manipulate the soft tissue balancing device with the femur and the tibia in flexion or extension.
In Example 49, the subject matter of any one or more of Examples 47-48 optionally include wherein manipulating the soft tissue balancing device includes applying tension to the joint using the robotic arm through the soft tissue balancing device during the soft tissue balancing test.
In Example 50, the subject matter of any one or more of Examples 47-49 optionally include outputting, from the robotic arm, a resection angle for an at least partial joint replacement to a computing device to calculate soft tissue balance in the joint.
In Example 51, the subject matter of Example 50 optionally includes calculating, using the computing device, a pin placement location for a cut guide based on the resection angle.
In Example 52, the subject matter of Example 51 optionally includes positioning, using the robotic arm, a pin placement trial for placing a pin at a location on the first bone according to the pin placement location.
In Example 53, the subject matter of any one or more of Examples 47-52 optionally include outputting, from a force sensor, force data indicative of soft tissue tension in the patient joint when the force is applied to the first bone by the soft tissue balancing component.
In Example 54, the subject matter of Example 53 optionally includes determining soft tissue tension at the patient joint based on the force data.
In Example 55, the subject matter of any one or more of Examples 47-54 optionally include moving the robotic arm to a soft tissue balancing test position and orientation relative to the first bone; controlling the robotic arm to retain the position and orientation relative to the first bone when the bone moves; and applying a force to the first bone using the soft tissue balancing component.
In Example 56, the subject matter of Example 55 optionally includes tracking movement of the first bone using an optical tracking system including a first optical tracker affixed to the first bone of the patient and a second optical tracker affixed to the robotic arm; and determining the tension in the soft tissue during a soft tissue balancing test using the tracked movement of the first bone.
In Example 57, the subject matter of Example 56 optionally includes tracking a position and orientation of the soft tissue balancing component when moved; and determining soft tissue tension using the position and orientation of the end effector and information from the optical tracking system including a position of the second optical tracker affixed to the robotic arm and a position of the first optical tracker affixed to the first bone.
In Example 58, the subject matter of Example 57 optionally includes determining a tension in medial soft tissue and a tension in lateral soft tissue using a force vector of the soft tissue balancing component on the first bone provided by the force sensor and a relative bone orientation of the first bone to a second bone provided by the optical tracking system.
Example 59 is a robot-aided surgical system comprising: an end effector of a robotic arm configured to apply a force to a tibia of a knee joint of a patient when the robotic arm is in contact with the tibia and moved in a specified direction to perform a soft tissue balancing test; and a display device to output an indication of tension in soft tissue during the soft tissue balancing test.
In Example 60, the subject matter of Example 59 optionally includes a force sensor to output force data indicative of soft tissue tension in the patient joint when the force is applied to the tibia by the robotic arm.
In Example 61, the subject matter of Example 60 optionally includes a processor to determine soft tissue tension at the patient joint based on the force data.
In Example 62, the subject matter of any one or more of Examples 59-61 optionally include an optical tracking system including a first optical tracker affixed to the tibia of the patient, the optical tracking system to track movement of the tibia.
In Example 63, the subject matter of Example 62 optionally includes a robotic controller to: move the end effector of the robotic arm to a soft tissue balancing test position and orientation relative to the tibia; control the robotic arm to retain the position and orientation of the end effector relative to the tibia when the optical tracking system indicates movement of the tibia; and apply a force to the tibia using the robotic arm.
In Example 64, the subject matter of Example 63 optionally includes a processor to: track a position and orientation of the end effector when moved by the robotic controller; and determine soft tissue tension using the position and orientation Af the end effector and information from the optical tracking system including a position of the first optical tracker affixed to the tibia.
In Example 65, the subject matter of any one or more of Examples 63-64 optionally include a second optical tracker affixed to the robotic arm, and wherein the robotic controller is to use a position of the second optical tracker affixed to the robotic arm to determine the position and orientation of the end effector relative to the tibia.
In Example 66, the subject matter of any one or more of Examples 59-65 optionally include a processor to enable a manual movement mode of the robotic arm, the manual movement mode allowing a surgeon to initiate movement of the end effector of the robotic arm, the initiated movement continued by augmented force applied by the robotic arm.
In Example 67, the subject matter of Example 66 optionally includes wherein the initiated movement causes the end effector to be in contact with the tibia.
In Example 68, the subject matter of any one or more of Examples 59-67 optionally include a processor to receive an indication to initiate the soft tissue balancing test, and in response, cause the robotic arm to initiate the soft tissue balancing test.
In Example 69, the subject matter of any one or more of Examples 59-68 optionally include a pin to couple the end effector to the tibia when the end effector is in contact with the tibia.
In Example 70, the subject matter of any one or more of Examples 59-69 optionally include a processor to determine a resection angle on a cut of a femur connected via the soft tissue to the tibia based on the indication of tension in the soft tissue determined during the soft tissue balancing test.
Example 71 is a tibial force detection system comprising: a tibial baseplate including: a plurality of force sensors to detect forces at corresponding locations of the tibial baseplate; and a plurality of actuators corresponding to the plurality of force sensors, the plurality of actuators causing the tibial baseplate to displace a femur from a tibia at respective locations; and a processor to: receive force information related to forces at the corresponding locations from the plurality of force sensors of the tibial baseplate; determine a rotation angle of the femur relative to the tibia based on the force information; and output the rotation angle for display.
In Example 72, the subject matter of Example 71 optionally includes wherein the plurality of force sensors include four force sensors corresponding to four quadrants of the tibial baseplate.
In Example 73, the subject matter of any one or more of Examples 71-72 optionally include wherein the plurality of actuators are configured to be activated independently of each other.
In Example 74, the subject matter of any one or more of Examples 71-73 optionally include wherein the plurality of actuators are activated to apply tension to one or more ligaments connecting the femur to the tibia until the one or more ligaments are in tension before determining the rotation angle.
In Example 75, the subject matter of any one or more of Examples 71-74 optionally include wherein the plurality of actuators include a number of actuators corresponding to a number of force sensors of the plurality of force sensors, and wherein the respective locations cause forces at the corresponding locations of the tibial baseplate.
In Example 76, the subject matter of any one or more of Examples 71-75 optionally include wherein the processor is further to use the rotation angle to determine a resection angle for a cut of the femur.
In Example 77, the subject matter of any one or more of Examples 71-76 optionally include wherein in response to a release cut being performed on soft tissue connecting the femur to the tibia, the plurality of actuators are further to cause the tibial baseplate to further displace the femur from the tibia at respective locations.
In Example 78, the subject matter of any one or more of Examples 71-77 optionally include wherein the plurality of actuators are to cause the tibial baseplate to release the femur from being displaced with respect to the tibia in response to the processor determining that the rotation angle is at a predetermined angle.
Example 79 is a method for performing a soft tissue pull test, the method comprising: performing a soft tissue balancing test, using a robotic arm, while a joint connecting a femur to a tibia is in extension; inserting a soft tissue balancing component attached to a distal end of a robotic arm; performing the soft tissue balancing test using the soft tissue balancing component and the robotic arm while the joint is in flexion to determine a rotation to balance ligaments in the joint; calculating pin placement for a cut guide based on the rotation; and placing the cut guide according to the pin placement using the robotic arm.
In Example 80, the subject matter of Example 79 optionally includes performing a cut using the placed cut guide.
In Example 81, the subject matter of any one or more of Examples 79-80 optionally include performing a tibial cut, using the robotic arm, before performing the soft tissue balancing test while the joint is in extension.
In Example 82, the subject matter of any one or more of Examples 79-81 optionally include wherein calculating the pin placement includes using surgical planning software.
In Example 83, the subject matter of any one or more of Examples 79-82 optionally include wherein the soft tissue balancing component is one of a spike, a condyle pivot, or a j-shaped adapter.
Example 84 is a robotic arm controller comprising: a processor to: receive force data indicative of soft tissue tension in a patient joint during movements of the patient joint by a robotic arm; receive tracking data for the movements of the robotic arm; determine soft tissue tension as a function of joint extension using the tracking data and the force data; and output the soft tissue tension as a function of joint extension.
In Example 85, the subject matter of Example 84 optionally includes wherein the processor is further to calculate a projected soft tissue tension as a function of joint extension using a model of at least one implant at a given location on a bone of the joint, and the actual soft tissue tension as a function of joint extension, wherein the output includes the projected soft tissue tension as a function of joint extension.
In Example 86, the subject matter of Example 85 optionally includes wherein the processor is further to determine alterations required on the bone to receive the at least one implant in the given location, using the model of the implant, wherein the output includes an alteration file for operating a robotized apparatus in effecting the alterations.
In Example 87, the subject matter of any one or more of Examples 84-86 optionally include wherein the processor is further to assess soft-tissue balancing by calculating a rotation of bones of the joints during robot manipulations of the bone.
Example 88 is a CAS controller comprising: a tracking device for producing tracking data representative of bone movements; a range-of-motion (ROM) analysis module configured for receiving tracking data for the bone movements and for determining range of motion and joint laxity data using said tracking data; a soft-tissue balancing module and an implant assessment module configured for updating joint laxity data and calculating resection planes as a function of a model of at least one implant at an adjustable location on a bone of the joint; and an output including the resection planes based on the adjustable location.
Example 89 is a robotic arm comprising: a tracking sensor to output tracking data indicative of movement of the robotic arm; a soft tissue balancing component affixed to an end effector at a distal end of the robotic arm, the soft tissue balancing component configured to apply a force to a bone of a patient joint when the robotic arm is moved in a specified direction; a force sensor to output force data indicative of soft tissue tension in the patient joint when the force is applied to the bone by the soft tissue balancing component; and a processor to: determine soft tissue tension at the patient joint based on the tracking data and the force data; and output the soft tissue tension.
In Example 90, the subject matter of Example 89 optionally includes wherein the soft tissue balancing component includes a spike.
In Example 91, the subject matter of any one or more of Examples 89-90 optionally include wherein the soft tissue balancing component includes a condyle pivot.
In Example 92, the subject matter of any one or more of Examples 89-91 optionally include wherein the soft tissue balancing component is affixed to the robotic arm using a removable pin guide end effector component.
In Example 93, the subject matter of any one or more of Examples 89-92 optionally include wherein the bone is a femur, and wherein the soft tissue balancing component includes a ligament pulling component configured to: snap in place on the end effector; and pull on the femur with a patella in place.
In Example 94, the subject matter of Example 93 optionally includes wherein the processor is to: receive patella location information from a sensor affixed to a back side of the patella; and output the patella location information during a range of motion test.
In Example 95, the subject matter of any one or more of Examples 89-94 optionally include wherein the force is applied while the patient joint is in extension.
In Example 96, the subject matter of any one or more of Examples 89-95 optionally include wherein the force is applied while the patient joint is in flexion.
In Example 97, the subject matter of any one or more of Examples 89-96 optionally include wherein the robotic arm is controlled using a virtual component displayed using an augmented reality device.
In Example 98, the subject matter of any one or more of Examples 89-97 optionally include wherein the soft tissue tension is output to a display device to be displayed on a user interface.
In Example 99, the subject matter of Example 98 optionally includes wherein the user interface is to display varus and valgus angles of the patient joint during a range of motion test.
Example 100 is a method of using a robotic arm to perform soft tissue balancing, the method comprising: tracking, using a processor, movement of the robotic arm to obtain tracking data; applying a force, using a soft tissue balancing component coupled to a distal end of the robotic arm, to a bone of a patient joint; measuring the force to capture data indicative of soft tissue tension in the patient joint when the force is applied to the bone by the soft tissue balancing component; and determining soft tissue tension at the patient joint based on the tracking data and the force data; and outputting the soft tissue tension.
In Example 101, the subject matter of Example 100 optionally includes wherein the soft tissue balancing component includes a spike.
In Example 102, the subject matter of any one or more of Examples 100-101 optionally include wherein the soft tissue balancing component includes a condyle pivot.
In Example 103, the subject matter of any one or more of Examples 100-102 optionally include wherein the soft tissue balancing component is affixed to the robotic arm using a removable pin guide end effector component.
In Example 104, the subject matter of any one or more of Examples 100-103 optionally include wherein the bone is a femur, wherein the soft tissue balancing component includes a ligament pulling component, and further comprising: snapping the ligament pulling component in place on the end effector; and pulling, using the ligament pulling component on the femur with a patella in place.
In Example 105, the subject matter of Example 104 optionally includes receiving patella location information from a sensor affixed to a back side of the patella; and outputting the patella location information during a range of motion test.
In Example 106, the subject matter of any one or more of Examples 100-105 optionally include wherein the force is applied while the patient joint is in extension.
In Example 107, the subject matter of any one or more of Examples 100-106 optionally include wherein the force is applied while the patient joint is in flexion.
In Example 108, the subject matter of any one or more of Examples 100-107 optionally include controlling the robotic arm using a virtual component displayed using an augmented reality device.
In Example 109, the subject matter of any one or more of Examples 100-108 optionally include wherein the soft tissue tension is output to a display device to be displayed on a user interface.
In Example 110, the subject matter of Example 109 optionally includes wherein the user interface is to display varus and valgus angles of the patient joint during a range of motion test.
In Example 111, the subject matter of any one or more of Examples 100-110 optionally include controlling the robotic arm to automatically detect a point on the bone; and registering the point as a landmark using the tracking data.
Example 112 is at least one non-transitory machine-readable medium including instructions for operation of a robotic arm, which when executed by at least one processor, cause the at least one processor to perform operations of any of the methods of Examples 100-111.
Example 113 is a tibial force detection system comprising: a tibial baseplate including a plurality of force sensors to detect forces at corresponding locations of the tibial baseplate; a processor to: receive force information for the corresponding locations from the plurality of force sensors of the tibial baseplate; determine a rotation angle of a femur relative to a tibia based on the force information; and output the rotation angle for display.
Example 114 is a robot-aided surgical system comprising elements of one or more of Examples 1-113.
In Example 115, the subject matter of Example 114 optionally includes performing a tibial cut, using the robotic arm, before performing the soft tissue balancing test while the joint is in extension.
In Example 116, the subject matter of any one or more of Examples 114-115 optionally include wherein the soft tissue balancing component is one of a spike, a condyle pivot, or a j-shaped adapter.
In Example 117, the subject matter of any one or more of Examples 114-116 optionally include wherein the processor is further to calculate a projected soft tissue tension as a function of joint extension using a model of at least one implant at a given location on a bone of the joint, and the actual soft tissue tension as a function of joint extension, wherein the output includes the projected soft tissue tension as a function of joint extension.
In Example 118, the subject matter of Example 117 optionally includes wherein the processor is further to determine alterations required on the bone to receive the at least one implant in the given location, using the model of the implant.
In Example 119, the subject matter of Example 118 optionally includes wherein the output includes an alteration file for operating a robotized apparatus in effecting the alterations.
In Example 120, the subject matter of any one or more of Examples 114-119 optionally include wherein the soft tissue balancing component is affixed to the robotic arm using a removable pin guide end effector component.
In Example 121, the subject matter of any one or more of Examples 114-120 optionally include wherein the soft tissue balancing component includes a j-shaped arm to couple to a femoral spike to allow for performance of the soft tissue balancing test with a patella in place.
In Example 122, the subject matter of Example 121 optionally includes wherein the processor is to: receive patella location information from a sensor affixed to a back side of the patella; and output the patella location information during a range of motion test.
In Example 123, the subject matter of any one or more of Examples 114-122 optionally include wherein the robotic arm is controlled using a virtual component displayed using an augmented reality device.
In Example 124, the subject matter of any one or more of Examples 114-123 optionally include wherein the soft tissue tension is output to a display device to be displayed on a user interface.
In Example 125, the subject matter of Example 124 optionally includes wherein the user interface is to display varus and valgus angles of the patient joint during a range of motion test.
In Example 126, the subject matter of any one or more of Examples 114-125 optionally include controlling the robotic arm to automatically detect a point on the bone; and registering the point as a landmark using the tracking data.
In Example 127, the subject matter of Example 126 optionally includes using the landmark to determine the tension in the soft tissue during a soft tissue balancing test.
In Example 128, the subject matter of any one or more of Examples 114-127 optionally include a removable holder, which when coupled to an end effector of the robotic arm, creates an anchor to receive a spike, the spike configured to couple the end effector to the bone.
In Example 129, the subject matter of any one or more of Examples 114-128 optionally include an attachment to couple to an end effector of the robotic arm, the attachment comprising a spike, a J-hook, or an L-hook.
In Example 130, the subject matter of any one or more of Examples 114-129 optionally include a spreader attached to a distal end of the robotic arm, the spreader configured to mechanically distract the first bone from the second bone in the joint to perform the soft tissue balancing test.
In Example 131, the subject matter of Example 130 optionally includes wherein the spreader includes a gear or a long lever arm to assist in mechanically distracting the first bone from the second bone.
In Example 132, the subject matter of any one or more of Examples 114-131 optionally include a processor to determine whether the soft tissue is in balance using information from a preoperative plan or image.
In Example 133, the subject matter of any one or more of Examples 114-132 optionally include wherein range of motion is tested postoperatively to determine success of the soft tissue balancing test.
Example 134 is at least one non-transitory machine-readable medium including instructions for operation of a robotic arm, which when executed by at least one processor, cause the at least one processor to perform operations of any of the methods of Examples 1-133.
Example 135 is a method for performing any one of examples 1-133.
Method examples described herein may be machine or computer-implemented at least in part. Some examples may include a computer-readable medium or machine-readable medium encoded with instructions operable to configure an electronic device to perform methods as described in the above examples. An implementation of such methods may include code, such as microcode, assembly language code, a higher-level language code, or the like. Such code may include computer readable instructions for performing various methods. The code may form portions of computer program products. Further, in an example, the code may be tangibly stored on one or more volatile, non-transitory, or non-volatile tangible computer-readable media, such as during execution or at other times. Examples of these tangible computer-readable media may include, but are not limited to, hard disks, removable magnetic disks, removable optical disks (e.g., compact disks and digital video disks), magnetic cassettes, memory cards or sticks, random access memories (RAMs), read only memories (ROMs), and the like.
Claims
1. A robot-aided surgical system comprising:
- a tracking system including a first tracker affixed to a bone of a patient, the tracking system configured to track movement of the bone;
- a robotic controller to:
- monitor a position and orientation of an end effector coupled to an end of a robotic arm;
- apply a force to the bone using the end effector;
- determine soft tissue balance using information from the tracking system including a position of the first tracker affixed to the bone; and
- output the soft tissue balance.
2. The robot-aided surgical system of claim 1, further comprising a soft tissue balancing component coupled to the end effector and configured to transfer force from the end effector to the bone.
3. The robot-aided surgical system of claim 2, wherein the soft tissue balancing component comprises at least one of a spike, a condyle pivot, a jig, or an adaptor, wherein the adaptor is shaped to avoid a patella or soft tissue of a knee joint of the patient.
4. The robot-aided surgical system of claim 3, wherein the soft tissue balancing component comprises the condyle pivot, and wherein the condyle pivot comprises a plurality of platform arms each capable of applying an individually determined force to the bone.
5. The robot-aided surgical system of claim 3, wherein the soft tissue balancing component comprises the jig, and wherein the jig includes at least one of a spacer block or a flat attachment.
6. The robot-aided surgical system of claim 1, further comprising a force sensor coupled to the robotic arm, and wherein to determine the soft tissue balance, the robotic controller is to use force information from the force sensor.
7. The robot-aided surgical system of claim 6, wherein the robotic controller is to determine the force information when a pull test performed by the robotic arm reaches a predetermined gap distance from the bone to a second bone, the force information indicative of an equal force between two ligaments connecting the bone to the second bone.
8. The robot-aided surgical system of claim 1, wherein to output the soft tissue balance, the robotic controller is to output an indication of the degree of rotation of the bone.
9. The robot-aided surgical system of claim 8, wherein the robotic controller is to determine a location to place a cut guide for resecting the bone using the robotic arm based at least in part the indication of the degree of rotation.
10. The robot-aided surgical system of claim 1, wherein the determined soft tissue balance indicates a difference in tension between a medial side and a lateral side of a knee joint of the patient.
11. The robot-aided surgical system of claim 1, wherein to output the soft tissue balance, the robotic controller is to output an amount of force applied by the end effector on the bone when the bone reaches a predetermined gap thickness in relation to a second bone.
12. The robot-aided surgical system of claim 1, further comprising a cutting device to perform a release of a portion of soft tissue connected to the bone based on the soft tissue balance.
13. The robot-aided surgical system of claim 1, further comprising a display device to display an indication of the output soft tissue balance or an angle of rotation of the bone relative to a second bone.
14. The robot-aided surgical system of claim 1, wherein the robot controller is further to determine alterations required on the bone to receive at least one implant in a given location, using a model of the at least one implant and the soft tissue balance.
15. A robot-aided surgical system comprising:
- a tracking system including a first tracker affixed to a bone of a patient, the tracking system configured to track movement of the bone;
- a robotic controller to:
- monitor a position and orientation of an end effector coupled to an end of a robotic arm;
- apply a force to the bone using a soft tissue balancing component coupled to the end effector, the soft tissue balancing component configured to transfer force from the end effector to the bone; and
- determine soft tissue balance using information from the tracking system including a position of the first tracker affixed to the bone and force information from a force sensor coupled to the robotic arm; and
- a display device to display an indication of the soft tissue balance including a tension of at least one ligament connecting the bone to a second bone or an angle of rotation of the bone relative to the second bone.
16. The method of claim 15, wherein the indication of the soft tissue balance includes an indication of a difference in tension between a medial ligament and a lateral ligament of a knee joint of the patient.
17. The method of claim 15, further comprising a cut guide coupled to the robotic arm to guide a resection cut in a joint replacement procedure based on the angle of rotation of the bone relative to the second bone.
18. The method of claim 15, further comprising a cutting device coupled to the robotic arm to perform a release of a portion of soft tissue connected to the bone based on the soft tissue balance.
19. The method of claim 15, further comprising a cut guide coupled to the robotic arm to guide a resection on a tibia of the patient before determining the soft tissue balance.
20. The method of claim 19, wherein the robotic controller is further to determine a pin placement location for a cut guide based at least in part on the angle of rotation of the bone relative to the second bone.
21. A robot-aided knee arthroplasty system comprising:
- a leg holder to affix anatomy of a patient during an arthroplasty procedure;
- an end effector of a robotic arm to couple to a femur of the knee joint with a soft tissue balancing component that permits the femur to freely rotate while coupled to the end effector;
- a robotic controller to:
- cause the robotic arm to apply a pulling force to the femur to increase a gap distance between the femur and a tibia of the knee joint;
- measure the gap distance between the femur and the tibia and a rotation of the femur; and
- store, when the gap balance is equal to a predetermined gap distance, the rotation of the femur as a target femoral implant rotation; and
- a surgical planning system to plan a position and orientation of a resection such that inserting a femoral implant on the femur causes the femur to achieve the target femoral implant rotation.
22. The robot-aided knee arthroplasty system of claim 21, further comprising a cut guide coupled to the robotic arm to guide a cutting device to perform the resection.
23. The robot-aided knee arthroplasty system of claim 22, wherein the robotic controller is to:
- determine a pin hole location on the bone based at least in part on the indication of the degree of rotation, the pin hole location determined such that a pin inserted into the pin hole location aligns the cut guide to the bone;
- cause the robotic arm to place a pin guide component, coupled to the end effector of the robotic arm, on the bone such that a drill hole of the pin guide component aligns with the pin hole location.
24. The robot-aided knee arthroplasty system of claim 21, further comprising a tracking system to track trackers affixed to the femur and the tibia and to output tracking information, and wherein to measure the gap distance between the femur and tibia and the rotation of the femur, the robotic controller is to use the tracking information.
25. The robot-aided knee arthroplasty system of claim 21, wherein the robotic controller is further to cause the robotic arm to apply a pushing force to the tibia and calculate a tension in a lateral collateral ligament and a medial collateral ligament of the knee joint as the pushing force is applied to the tibia with the robotic arm, and further comprising a display device to display an indication of the tension in the lateral collateral ligament and the medial collateral ligament.
26. At least one machine-readable medium including instructions for performing robot-aided surgery, which when executed by a processor, cause the processor to:
- cause a robotic arm to apply a pulling force to a femur, using a soft tissue balancing component coupled to the femur such that the femur freely rotates, to increase a gap distance between the femur and a tibia of the knee joint;
- measure the gap distance between the femur and a tibia and a rotation of the femur; and
- calculate a target femoral implant rotation using the rotation of the femur, when the gap balance is equal to a predetermined gap distance;
- store the target femoral implant rotation; and
- plan, using a surgical planning system, a position and orientation of a resection such that inserting a femoral implant on the femur causes the femur to achieve the target femoral implant rotation.
27. The at least one machine-readable medium of claim 26, further comprising instructions to:
- track trackers affixed to the femur and the tibia;
- output tracking information; and
- use the tracking information to measure the gap distance between the femur and tibia and the rotation of the femur.
28. The at least one machine-readable medium of claim 26, further comprising instructions to:
- cause the robotic arm to apply a pushing force to the tibia;
- calculate a tension in lateral and medial compartments of the knee joint as the pushing force is applied to the tibia with the robotic arm; and
- output an indication of the tension in the lateral and medial compartments.
29. The at least one machine-readable medium of claim 26, further comprising instructions to determine a pin placement location for a cut guide based at least in part on the rotation of the femur.
30. The at least one machine-readable medium of claim 29, further comprising instructions to cause the robotic arm to position a pin placement trial for placing a pin at a location on the bone according to the pin placement location.
Type: Application
Filed: Jun 15, 2017
Publication Date: Dec 21, 2017
Patent Grant number: 10136952
Inventors: Pierre Couture (Montreal), Alain Richard (Lachine), Olivier Boisvert (Montreal), Emily Gogarty (Montreal), Louis-Philippe Amiot (Montreal), Sebastien Parratte (Marseille), Di Li (LaSalle)
Application Number: 15/624,621
